File



Patented Mar. 3, '71925.

UNITED sr-Aras -lnonnar r. ADAMS, or FORD, WASHINGTON.

FILE.

Application filed July 25, 1924. Serial No. 728,254.

To all who/m, t may concern.' Y

Be it known that I, ROBERT P. ADAMS, a citizen of the United States,residing at Ford, in Stevens County and State of Washington, haveinvented certain new and useful VImprovements in Files, of which thefollowing is a specification.

The present invention relates to improvements in files whichimprovements are herein illustrated and embodied in a rectangular,single-cut lile, but it will be apparent that a double-cut file orsimilar tool of other shape may be utilized for the application of myinvention. l

The primary object of`- my invention is the provision of a fileespecially adapted for use by Vwood sawyers for sharpening the teeth ofsaws. In addition to theperformance of the usual functions of a tool ofthis type in sharpening Saws and for other` purposes, means are providedfor removing the rough edges of the raker teeth of cross cut saws. Thisobject is accomplished by applying the file to the concave curved edgeof the raker teeth, to sharpen and maintain the teeth in best conditionfor their work.

Under ordinary conditions when an angular file is used for the abovementioned purpose, the angular file cuts intothe saw teeth and weakensthem, rendering the tooth liable to breakage. The breaking of a toothresults in the necessity for filing the whole saw for the purpose offorming new raker teeth for cooperation with the-cutting teeth of thesaw.

I eliminate the possibility of this undesirable condition and consequentloss in time and labor in re-sharpening the saw by providing arectangular file with a rounded portion which readily adapts itself lforthis purpose.

The invention consists in certain novel combinations and arrangements ofparts in the construction of the file as will hereinafter be more fullypointed out and claimed and as illustrated'in the drawings.

The drawings show one complete example of the physical embodiment ot myinvention wherein the features are combined and arranged according tothe best mode I have thus far devised for the practical application ofthe principles of my invention.

Figure 1 is a perspective view showing a 4file embodying the inventionand in position for use by the Sawyer when sharpening a raker tooth of across cut saw.

Figure 2 1s an enlarged detail view in cross section ofthe file showingit in operative position for filing the curved edge of a raker tooth ofa saw.

type of flat file indicated as a whole by theV numeral l, the tang 2 andwooden handle 3 being of usual or suitable formation.

Along one of the longitudinal edges as l of the file is fashioned aSmooth portion 4. which is rounded with a convex curve in a planetransversely of the rectangular file, the teeth or cutting ribs 4 on oneflat face of the file and the angularly disposed teeth 4: von theadjacent edge of the file terminating at and merging with the oppositesides of this rounded smooth portion. The terminals of the file teeth atthe opposite sides of this smooth portion 4, as shown in Figure 2 areutilized for operation on the raker tooth 5 of a cross cut saw. Betweenthe raker tooth and the adjoining cutting tooth 6 a space is provided,and the forked raker tooth as usually constructed is fashioned with aconcave edge 7.

. Figure 2 illustrates the use and action of the file of my inventionwherein the convex round-ed, longitudinal edge of the file may passharmlessly along the concaveedge of the tooth without danger of ruiningthe tooth, but permitting the iiat face of the file to remove the burrfrom the cutting edge of the tooth.

By preference and to make an efficient tool, I use line teeth on theupper face of the le and comparatively coarse teeth on the under face.Likewise, the right edge is correspondingly coarser than the left. Thisto permit finer finish of the cutting edges, the tine le on top comingnaturally to iinish the under parts of the raker teeth while the coarserteeth of the file I use for the purpose of slimming the teeth and filingthe tops of the rakers.

Having thus fully described Iny invention, what I claim as new anddesire to secure by Letters Patent is:-

l. A rectangular file having a rounded,

6 smooth longitudinal edge.

2. A rectangular file lia-ving cutting teeth on its Hat face and on itsadjoining'perpendieular side, and a smooth longitudinally v extendingedge between said two sets of 19 teeth.

3. A rectangular le having standard eutteeth on the bottom face and onthe. right edge, With ner teeth on the top face and left edge, and asmooth, longitudinally extending edge between sa'id two Sets of finerteeth.

In testimony whereof I affix my signature.

-ROBERT P. ADAMS.

